Malicious PDF — malware analysis report

Static analysis result for SHA-256 c82dc3ca466b60e0…

MALICIOUS

PDF

75.7 KB Created: 2021-02-25 11:58:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 67c71740caff7ce279bf72777dd89538 SHA-1: def64310a680cf64c22e8ea0cefff457834aaeab SHA-256: c82dc3ca466b60e0b232478216407fffd0ca8f00fcb769a6304d8f536ef9ae4a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded content, though obfuscated, appears to be related to search queries, reinforcing the lure aspect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jottigo.ru/strik?utm_term=what+is+the+atomic+number+of+first+20+elements PDF link annotation
    • https://pozefixinez.weebly.com/uploads/1/3/1/4/131454190/3fc1cc67d4bc.pdfIn PDF document text
    • https://cdn.sqhk.co/rifokinimito/W365OYh/portable_launch_monitor_for_golf.pdfIn PDF document text
    • http://new-leggins.site/zujipuwio5480.pdfIn PDF document text
    • https://zixudepapu.weebly.com/uploads/1/3/2/3/132303172/tibixetin-pakerutawi-mokazarulej-maxos.pdfIn PDF document text
    • https://cdn.sqhk.co/boxokozofe/UoXG4kX/durelisenidefofaxifivo.pdfIn PDF document text
    • https://putepinezuvoko.weebly.com/uploads/1/3/1/8/131856998/7897000.pdfIn PDF document text
    • http://douchehq.xyz/gijukawa2viqi.pdfIn PDF document text
    • https://jofexudu.weebly.com/uploads/1/3/5/2/135295173/sinif-fabap-solug-givasizi.pdfIn PDF document text
    • https://nozirurabi.weebly.com/uploads/1/3/0/7/130738896/wubufutojoloda.pdfIn PDF document text
    • http://lyudi23.ru/ball_painting_activity1qzv6.pdfIn PDF document text
    • https://pukegivox.weebly.com/uploads/1/3/1/8/131856392/9212393.pdfIn PDF document text
    • http://findattime.com/tibafogutepojodekixobenhv0a.pdfIn PDF document text
    • https://cdn.sqhk.co/malofavu/imjiidl/tuzabuxadowifoveji.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/hfjfwic/sad_ringtone_download_mobcup.pdfIn PDF document text
    • https://cdn.sqhk.co/rujiwujik/hhGumia/direct_flights_to_miami_from_lax.pdfIn PDF document text
    • http://noverst.xyz/remove_password_from_excel_2016_sheetqetgp.pdfIn PDF document text
    • http://siankaanmexico.com/tigirotakatapuvodipadfc846.pdfIn PDF document text
    • http://wssummer.space/sejisejajefebonitobed2oy0p.pdfIn PDF document text
    • http://nasporte1.fun/whitewashed_brick_effect4vcmq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nowonovege/albatross_bhool_song.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/62813753290.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/nonujetupalavaxuxifele.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B1 5548 bytes
SHA-256: ad327a7dc7b95e1cdf568a1a079e2f4bceff2b660fa2897c224c61a9c671e426
font_01_sfnt_off0000f96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96E 11696 bytes
SHA-256: c904442626989a6773039afc0a21a490ed27cefe54f39168c6c6fee45a0920d7